Year: 2013

Evaluation of Mobile Eyetracking as Input Modality for Multitouch Surfaces

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Eyetracking as an Input Modality

Multi-touch surfaces enable highly interactive and intuitive applications. Nevertheless large devices are also constrained. It’s possible that users cannot reach every part of the display without walking around or leaning on the surface. To compensate this restriction, I present a method to use mobile eyetracking as an additional input modality. In particular I propose an approach relying on marker-based display recognition and homogeneous transformations. In a user study I evaluated the implementation in terms of accuracy. As result I extracted some design guidelines for building interfaces and considered how to solve limitations of the proposed system.

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Raytracer | Computer Graphics

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During my studies in winter term 2011/2012 I attended the course computer graphics at Saarland University. It provided much theoretical knowledge about rendering, especially for raytracing. Aside every student had to consolidate his knowledge by implementing essential parts of a raytracer in C++. Finally there was a rendering competition. The main task was to implement certain features, such as procedural shading or photon mapping. Additionally one had to design a 3D scene and a corresponding website emphasizing these features. You can see my final rendering below.

Computer Graphics Scene

Computer Graphics Scene

You can find some more submissions on the lecture page.

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The Bee – Portable Audio System

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With the BG 20 Cross I built a portable audio system on wheels. But it was not suitable for all occasions, because it’s too big and too heavy. Accordingly I planned a smaller system, which could be carried by hand. Equal to my other systems I relied on Visaton drivers and the simulation software Boxsim. This time I challanged myself and tried to develop the crossover on my own. Nevertheless I consulted the Visaton forum to discuss and optimize my draft. Finally I finished my construction in spring 2013. You can see the result in the image below:

The Bee - Portable Audio System

The Bee – Portable Audio System

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Bachelor Thesis: Phone2Phone Mobile Payment

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On 5th of December I handed in my Bachelor Thesis. My topic was Mobile Payment with Smartphones and how one can embed such a system to a market. But what’s it all about?

Mobile Payment

Mobile Payment

Many well-known companies such as Google, Microsoft or PayPal deal with Mobile Payment procedures based on Near Field Communication (NFC). Facing the great market for mobile Apps and upcoming solutions, it’s obvious that a trend to NFC-based systems emerges. My work covers this field and extends it by enhancing processes for retail. Further I put emphasize on maintenance of product information, cart management and the checkout process. Thus clients as well as employees shall be unburdened. Accordingly a software solution is introduced, based on the operation system Android and the transmission standard NFC.

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BG 20 Cross – Mobile Audio System

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Motivation and Requirements

Till now I focused on stationary audio systems for inside. As you might derive from the title this project targets on a mobile audio system. There are different reasons, why I decided to plan and build the BG20 Cross. The most reasonable was the need of such a system for the yearly tour on Labour Day (in germany: first of may) with my sports club. Accordingly the system had to match certain requirements:

  • Powered by battery
  • Proper duration
  • Mobility
  • Adequate audio quality and volume
  • Low cost

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Visaton SUB T-30.60

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With this project (end of 2010) I intended to support the 2 Visaton Aria in my surround system. After some considerations I came to the decision to use the driver TIW 300 – 8 Ohm of Visaton. There are two constructions, suggested by Visaton: TL-SUB 30 and SUB T-30.60. Let’s say, the Visaton SUB T-30.60 was the more reasonable alternative, thus it became the choosen one. After this final judjement I began to search for an adequate amplifier. With some help of the Visaton forum I found the RCM Detonation DT 80, an 80W (sine) class D amp.

Now you might think, “80W, isn’t this unsufficient?”. Well, I can assure it’s fairly enough. With a usual amperemeter I got 60W at maximum when watching a BluRay. And 60W sounds like an airplane flying through my room (14m²). Aside, this wasn’t even full volume.

But now some information on how I assembled this speaker. As for the Visaton Aria I first prepared the acoustic baffle. The material was again MDF, but this time 19mm thick. This time painting was sourced out, because the result for the Aria was not fully satisfying. Nevertheless I’m proud to present the final result:

Visaton SUB T-30.60

Visaton SUB T-30.60

Further information on this speaker can be found on the manufacturer’s website.

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Visaton Aria

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In this post I present my first self build loudspeaker, the Visaton Aria. Actually I built two and used them as front speakers for my surround system. This project was realized in 2010.

First step was cutting the acoustic baffle for each (see image below). Therefore I used a router and a circular saw. The material is 16mm MDF.

acoustic baffle

acoustic baffle

After cutting all the rest (frame and back plane) I used wood glue to assembly the parts. Most extensive work was painting the boxes. I’ve choosen white acrylic lacquer and attached it with a roller. For the result see the image below:

Visaton Aria

Visaton Aria

For more detailed information about the loudspeaker visit the product page on Visaton.